The TomTom Car Kit for iPhone lets you consolidate the number of devices carried around by elevating iPhone navigation to a standalone navigation device level. It's pricey, but TomTom gives users a fair amount of functionality for the money.

If you shoot primarily outdoors in daytime--especially sports, children and animals--the Sony Cyber-shot DSC-H9 is a great choice. The cheaper DSC-H7 has a smaller LCD, lacks infrared shooting, and has a few interface differences, but is otherwise identical.